This basemap is present in the GPSMAP 175, 180, 185, 215, 225, 230, and 235

The Marine basemap includes worldwide coverage of the continents down to a 64 nm range. The standard map coverage for the Marine basemap includes:

1. Oceans and rivers
2. Lakes greater than 30 sq. miles
3. Principal cities with population greater than 20K
4. Major interstates and/or motorways and principal highways
5. Political boundaries (state and international border)

1. United States, including Alaska and Hawaii: In addition to the standard map coverage, it also includes:
   1. Coverage down to a 32 nm range
   2. Lakes greater than 5 sq. miles, major streams and rivers
   3. National and State level roads, plus some local roads in or near urban areas

    

2. Western Europe: In addition to the standard map coverage, it also includes:
   1. Lakes greater than 5 sq. miles, major streams and rivers

Specifications are subject to change without notice.